I have three spoons which, with the help of previous posts by blakstone, I have been able to date as Berlin 1818-42. The primary assayer was J. C. S. Kessner, and the secondary assayer was B. G. F. Andreack. I assume Kruger is the maker's name.
What I'd like to know is what the R is, and if this pattern of spoon is common in Germany, and if so, its name.
The style is called "lancet", and is characterized by the pointed handle. Your "lanzettlöffel" (love that word! = "lancet spoons") are a little more sophisticated than most, though, being less pointed, more spatulate, and having an underside rib. This style was very, very popular in Germany and central Europe in the first half of the 19th century, with its heyday about 1820-1840.
Sorry I can't help with the maker(s); my resources for Berlin silversmiths are limited - but I have seen Krüger's mark as late as the 1860's. I think the "R" mark is that of the manufacturer, and Krüger the retailer. "R" could be a workman in Krüger's shop, but even in the 1840's it was not uncommon for a silversmith to augment his wares with those from another shop.